EMPLOYEE BENEFITS (Components of Net Periodic Benefit/Cost) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.8
Interest cost	0.9
Expected return on plan assets	(1.4)
Amortization of loss from earlier periods	0.2
Gain on curtailment(1)	(0.4)
Net periodic pension benefit cost	0.1
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1
Net periodic pension benefit cost	$ 0.1